Pinion puller



1,631,664 June 1927' .1. L. WELLIAMSON PINION FULLER Filed July 17 1924 lnven or:

James L. 'iamson, y W [4% His A ttorfney Patented June 7, 1927.

UNITED ST 1 1,631,664 PATENT OFF-{6E5 J'AMEsnwI IAMson, onsonnnnornnvgnnw YORK, Ass GNoR rro GENERAILELEC- TRICVCOMPANY, n CORPORATION on NEW YORK.

IP'INION FULLER.

Application filed aui v, 1924. SerialNo. 7265620.

} My invention relates to adevice for removing pinions from the ends of shafts and the like and more particularly to a device for removing pinions from-the shafts of dynamo electric machines having a tapered end on which the pinion is mounted.

The removal of pinions from the ends of motor shafts aft-er they have been in operation for some time, presents a very difficult and tedious operation unless proper means are provided. In the past, various types of devices for doing this workhave been devised. The most common of these devices utilize the jackprinoiple, whereina jack screw is forced in against the end of the shaft and exerts an outward pressure upon the pinion through suitable pinion engaging means. This type of'device works quite satisfactorily where the motor is secured to a foundation or the force required is relatively small. It frequently happens, however, that in order to operate a device of this type, the operator will provide himself with a long bar in order to increase the leverage upon the jack screws. -lVh'en this is done a great amount of force can 'be exerted with little effort. on the part of the operator. VVhen'such a long bar is used and a great amount of force is required; if the motor is notsecured to ayfoundation, the motor will move around in response to the pull on the jack screw lever and thus make the operation difficult Another bad feature of this type of pinion removing'device is that the shaft'is subjected to strains which "frequently distort it and thus make it necessary to remove and straighten the shaft.

Another method of removing pinions' which is often resorted to, is the drlvlng of wedges down between themotor frameand the inner end of the pinion; This is doneby providing two wed es arrangeddiametrically opposite each other and striking first one and then the other ofthewedges until the pinion is loosened. This method of removing pinions is very disastrous in its re sults. It distorts the shaft and also injures the bearings through which the shaft eX- tends.

The object of my invention is to produce a device for doing the above class of work which will overcome the disadvantages heretofore encountered, and which will be inexpensive to manufacture and will be simple and easy to operate.

The various features of novelty which characterize my invention are pointed out with particularity in "the claims annexed to and forming a part of this specification. F or a better understanding of myinvention, reference may be had to the following description taken in connection with the accompanying drawing, in which Fig. l is a ver tical sectional view through a device embodying my invention. -Fig. 2 is a plan view partly in sectionof the device shown in Fig. 1, and Fig. 8 is a sectional View taken along the line 33 of Fig. 1 looking in the direction of the arrows.

In the drawing a pinion 10 is shown mounted upon a shaft 11 and having a device embodying the preferred form of my invention applied for the purpose of removing it from the shaft. In this embodiment of my invention two jaws 12 are-provided which engage the pinion 10. These jaws 12 are provided with eXtcndi-ngpor- .tions 13 which provide a support for wedging members 14 and 15'. A wedge 16' is adapted to be placed between the wedging members 14 and 15 in sucha manner that when it is driven in, pressure will be exerted against the end of the shaft 11 and the inner end-of the pinion 10 which will force the pinion from the shaft.

The jaws 12 are provided with a tapering outside surface over which a ring 17' is slipped for the purpose of holding the jaws together and in engagementwith the pinion 10. lV'hen the jaws 12 are assembled as above, theyform a cylindrical housing which surrounds the pinion 10 and the extending portions 13 project out beyond the end. of the pinion 10. This arrangement has a minimum of parts and is easily adjusted in use.

It has the advantage that the jaws 12 completelyengage the pinion and insure against its being pulled offnn'evenly and injuring :F the'shaft. The extending'p ortions 13 of the jaws 12 are provided with an adjustable extension member including screw 18 and a nut 19 which can be adjusted to compensate for varying lengths of shaft and'location of the pinions 10 on the shaft, the screw 18 being located in line with the shaft extension. It should be understooch however that the screw 18 and nut 19 can be dispensed with and the same results obtained by providing wedging members 11 and 15 or wedges 16 of different thicknesses. The adjusting screw it from turning with the screw 18. The ex tending portions 13 also have openings 23 through which the wedging members 14: and

15 and the wedge 16 project. These openings 23 are made sufficiently large to leave considerable clearance around the wedging members and the wedge. When the latter members are in place, the wedging member 14- will engage the end of shaft 11 and wedging member 15 will engage the screw 18 and the wedge 16 will be placed between the wedging members 14 and 15. These members will then extend transversely at the shaft center line. The wedging members 14 and 15 are longer than the wedge 16 and are shown in Fig. 1 with their lower ends broken off. It'should be understood however that they should extend downward sufficiently far to engage a'suitable support which will prevent them from moving downwardly and sliding over the end of the shaft 11 and exerting a downward force thereupon as a result. These wedging members are provided with flanges along their vertical edges which project inwardly and form a box into which the wedge 16 is placed when started. This construction makes it easy to start the wedge properly and also guides the wedge as it is driven in toremove the pinion.

hen the above described device is in operation, as will be evident from the draw ing and the description, the force necessary to remove a pinion will be exerted in a useful direction only. In other words, the force will be exerted straight out from the end of the shaft and when properly used with a suitable support for the wedging members 14 and 15 it cannot in any way injure the motor or the shaft.

IVhile I have shown mydevice as applied to a shaft having an end which projects out.

beyond the end of the pinion, it will be evident that my device can be used on shafts which have their ends flush with the end of the pinion, by providing a small block or spacer which is slightly smaller than the hole in the pinion.

From the above description it will be seen that I have provided a device for removing ombination of jaws adapted to engage the pinion, a wedging member adapted to engage the end of the shaft upon which the pinion is mounted, a second wedging member, means extending from said jaws adapted to engage said second wedging member, and a wedge adapted to be driven between said wedging members to thereby remove the pinion from the shaft, sai'd wedging members being longer than said wedge.

2. In a device for removing pinions from the ends of motor shafts and the like, the combination of longitudinally tapered jaws formed to engage the pinion, a ring engaging the tapered portion of said jaws for clamping them in engagement with the pinion, and means between the shaft and said jaws for forcing the pinion along the shaft.

3. In adevice for removing pinions from the ends of motor shafts and the like, the combination of longitudinally tapered jaws formed to engage the pinion, a ring engaging the tapered portion of said jaws for clamping them in engagement with the pinion, an adjustable extension member supported by said jaws, and means between said adjustable extension member and the shaft for forcing the pinion along the shaft. 7

1. In a device for removing pinions from the ends of motor shafts and the like, the combination of longitudinally tapered jaws, an adjustable extension membensaid jaws being formed to engage said pinion and said adjustable extension member, a ring engagmg the tapered portion of said jaws for;

clampin them relative to the pinion and the adjustable extension member, and means between said adjustable extension member and the shaft for forcing the pinion along the shaft. V

In witness whereof, I have hereunto, set my hand this 11th day of July, 1924.

JAMES L. WILLIAMSON. 

